Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-08-26
Astronomy and Astrophysics
Astrophysics
4 pages (Latex), 2 Postscript figures, final version to be published in A&A Letters
Scientific paper
It is usual, in gamma-ray burst (GRB) studies, to compare the average properties of bright and faint GRBs, with the assumption that brightness classes reflect distance classes. When brightness is intented to reflect the distance to the sources, it is nevertheless important to use a quantity with a small intrinsic dispersion. We propose here a method to compare the intrinsic dispersion of various measures of GRB brightness. This method assumes that nearby bursters are homogeneously distributed in an Euclidean space with no density or luminosity evolution. We then use it to compare 5 measures of GRB brightness in the BATSE Catalog. Our analysis reveals that better (i.e. less dispersed) measures of brightness are obtained at low energy and that GRBs are much closer to standard candles below 100 keV than above. We suggest that a beaming of the emission above 100 keV could explain this behaviour.
No associations
LandOfFree
Gamma-ray bursts: towards a standard candle luminosity does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Gamma-ray bursts: towards a standard candle luminosity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gamma-ray bursts: towards a standard candle luminosity will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-582970